Grinding-wheel.



G. HART.'

GRINDING WHEEL.

APPLICATION FILED JUNE 1, 1909.

'Patented Jan.'4',191o.

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GILBERT HART, OF `Dli'lllEtOIlll, MICHIGAN.

p GRINDING-WHEEL.

To all whom it may concern: Be it known that I, GILBERT HART, a zen of the United States, residing at Detroit, in the county-of lVayne and State of Michigan, have invented new and useful Improvements in Grinding-Wheels, of which the following is a specification.

This invention relates to new and useful improvements in grinding wheels and it has more particular reference to a grinding wheel of that general typewhich is disclosed in my prior' U. S. Patents, No. 77 9,8348, granted January l0, 1905, and No. 825,460, granted July 10,1906, in which plates inter'- ockably related to and carrying grinding segments are positioned in conterminous relation upon the rim of a spider or wheel body.

The present invention proposes an improvement in the segment locking means, the ultimate purpose ofwhich is to provide more efficiently against the bursting ofthe wheelor the displacement of the segments by centrifugal force, it'being understood that in grinding wheels of large size and requiring a considerable amount of horse power for their operation, the segments should be held in place in the strongest .possible way.

. 1n the accom Janying drawings, I have illustrated' a pre erred and advantageous embodiment of the invention. I

In the said drawings: Figure `l is a side elevation of a grinding wheel 4constructed in accordance with the present invention. Fig. 2 is an enlarged longitudinal sectional view of one of the segments and its securing plate, vshowing in detail the novel interocking means. Fig. 3 isa detail perspective view of one of the segments, the others being similarin construction, and Fig. 4 is a detail perspective view of one of the secur- Specca'ton of Letters Patent. Application led .Tune 1, 1909.I `Serial No. 499,381.

citiing plates, showing the interlocking meansy carried thereby, the other plates being similar in construction.

Similar characters of reference designate corresponding parts throughout the several views.

The type of structure referred to. comprises essentially the spider l, the grinding segments 2 and the securing plates 3, which are interlockably related to the segments 2 and which are secured rigidly to the rim of the spider l by suitable fastenin means providing for their removal, as, or example, bolts 4. This structure, as thus generally7 stated, is shown in my two prior patents to which reference has-been made.

Fateted Jan. 4, 1910.

The segments 2, of which any desired number may be employed, may be constructed of any material suitable for the purpose for which the wheel is used, as, for example, emery, used for grinding' purposes, and which is molded and afterward baked. The seoinent thus formed is provided with a suitabe number of transverse recesses, as 5, which are preferably of L shape and disposed ink parallelism. The recesses, by virtue of their shape, have circumferential legs and radial legs, the latter increasing in width as they exten-d outwardly.

The plates 3 are provided with a number of transverse projections, as 6, which corre-` s pond to the recesses 5 and in the embodiment shown are of L shape. These projections may be of Wrought iron and riveted to the plates, as lshown in the drawings, or they may be cast onthe plates, or rigidly attached thereto 1n any other suitable manner. Their circumferentlal legs corres ond in dimenfsions to theA circumferentia legs of the recesses 5 but their radial legs are of less eX- tent and less transverse width than the radial legs of the recesses 5, andA are preferably provided with c orrugations, as 7, which extend longitudinally ofthe projections 6.. The radial legs of the projections extend into the radial ortions of the recesses 5 and are spaced rom the walls ofsaid radial portions, as shown more particularly in Fig. 2. Filling spaces are thus aorded which extend transversely of the segment and into which is poured, while in a plastic or molten'state,

any suitable self-hardening material, indii' cated by the vnumeral 8, as, for example, brimstone, to effect a rigid and permanent union between the segments 2 and the projections 5. This union is rendered the more etlicient'by reason of the employment of the corrugations 7 which provide for a strongerv grip of the cementitious bond and overcome any liability of the disengagement of the projections and theI brirnstone under a very stron degree of centrifugal force, which liability might otherwisefbe' incident to the conditions noted if the projections 'were smooth faced.

It. will be noted that the radial legs of the recesses 5, aside from being of greater dimensions than the radial portions of the projections 46, are of substantial, inwardly tapering, wedge shape, and this 4formation lprovides a further safeguard against the tendency of the projections` to pull from lli the hond, since the obvious result of any infinitesimal or imperceptible outward radial movement of the segments would result in produciiw a stronger Wedging compression of the filling material against the projections, thereby tightening the grip of the latter.

rl`he self-hardening material, aside from its primary function, noted in the foregoing description, efficiently strengthens the segments along their lines ot connection to the securing plates and provides against the Wearing down of the projections, which, in the course oit time would he an incident to loose play, even though slight.

The embodiment herein shown, in so far as I am aware at the present time, is preferred, but. it will be understood that no speciiic description or disclosure herein contained is intended to have a limiting effect on the claims.

Having fully described my invention, I

claim:

ing a transverse recess in its inner face, a

projection extending transversely of the rim,

rigidly associated therewith, and disposed in the recess, the projection having corrugated side faces, and a self-hardening material disposed in the recess and surrounding the projection.

3. In a wheel structure of the type set forth, a spider having a rim, a segment having a transverse inwardly tapering recess in its inner face, a projection extending transversely of the rim, rigidly associated therewith and disposed in the recess, the projection having corrugated side faces, and a self-hardening material disposed in the recess and surrounding theprojection.

4. I. a vwheel structure of the type set forth, a spider having a rim, a segment having its inner face provided with a recess which comprises a radially disposed inwardly tapering leg and a circumferentially eX- tending leg, a projection rigidly associated with the rim and having a radial portion disposed in the radial leg of the recess and a circumferential portion disposed in the circumferential leg of the recess, and a selfhardening material disposed in the radial leg of the recess and inclosing the radial leg of the projection.

In testimony whereof I have hereunto set my hand in presence of tWo subscribing Witnesses.

GILBERT HART.

Witnesses THOMAS V. DU'r'roN, MlcHAEL H. DEuPsEY. 

